CN105977112A - Electric leakage circuit breaker - Google Patents

Electric leakage circuit breaker Download PDF

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Publication number
CN105977112A
CN105977112A CN201610460929.1A CN201610460929A CN105977112A CN 105977112 A CN105977112 A CN 105977112A CN 201610460929 A CN201610460929 A CN 201610460929A CN 105977112 A CN105977112 A CN 105977112A
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CN
China
Prior art keywords
circuit
control unit
central control
phase
switch
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CN201610460929.1A
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Chinese (zh)
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不公告发明人
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Individual
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Individual
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Priority to CN201610460929.1A priority Critical patent/CN105977112A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/66—Power reset mechanisms
    • H01H71/70—Power reset mechanisms actuated by electric motor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device

Abstract

The invention relates to an electric leakage circuit breaker, which comprises a shell, wherein a release and a control circuit are arranged in the shell; the control circuit comprises a central control unit, an electric leakage detection sensor for detecting A phase, B phase and C phase of power supplies, a tripping drive circuit and a stepper motor; the tripping drive circuit is connected with the central control unit; the electric leakage detection sensor is connected with an electric leakage detection signal input end of the central control unit through an amplification circuit; a closing control signal output end of the central control unit is connected with a power supply end of the stepper motor through the drive circuit; and the control circuit also comprises a digital switching circuit which is connected with the central control unit. A user can conveniently adopt different thresholds of abrupt change leakage current and slow change leakage current according to different usage occasions by controlling the digital switching circuit; and the practicability is relatively high. A first preset value (an abrupt change leakage current value) is set to be 50mA or 75mA; a protection effect can be put into a play in an electric shock of a human body; and an electric shock accident can be effectively avoided.

Description

A kind of RCCB
Technical field
The present invention relates to a kind of RCCB.
Background technology
Chinese patent literature notification number CN200941549Y discloses a kind of small motor protector; the current signal of motor major loop is converted into small-signal current by transformer; single-chip microcomputer is delivered to after signaling conversion circuit and signal conditioning circuit; single-chip microcomputer carries out electric leakage sampling, three-phase current sampling to it; and judge whether electric leakage, phase shortage, short circuit, stall, three-phase imbalance, overload successively; and then drive LED display module to show by display driver circuit, and cut off the input power of motor by output control circuit.Open also a kind of RCCB of Chinese patent literature publication number CN1622414A.
It is in place of above-mentioned the deficiencies in the prior art: inconvenience cannot be brought according to the gradual leakage current in power supply circuits and the situation automatic trip of sudden change leakage current and automatic closing to use.
Chinese patent literature notification number CN2496166Y disclose a kind of have gradual and sudden change two adjusting meanss earth leakage protective device; selected variable (gradual with sudden change) reference signal circuit that switch forms with at least three resistance variable with corresponding (gradual with suddenly change) comparator circuit to be connected by multidigit, separately constitute the gradual and device that can regulate respectively that suddenlys change.The program is disadvantageous in that: using analog circuit to realize gradual and sudden change leakage current monitoring, reliability is relatively low, and the program cannot realize the function of automatic trip and combined floodgate in conjunction with gradual and sudden change leakage current situation.
Chinese patent literature notification number CN2427915Y discloses a kind of monophase leakage protector, including performing circuit, leakaging signal detecting circuit, over-current signal testing circuit, gradual electric leakage signal output circuit, sudden change electric leakage signal output circuit, over-current signal integration output circuit, over-current signal amplification output circuit, automatic reset circuit, reset lockout circuit, test and display circuit etc..Its after earth leakage protective action can automatic reclosing once.The program is disadvantageous in that: using analog circuit to realize the gradual monitoring with sudden change leakage current and shutting-brake control, be easily disturbed, reliability is relatively low.
Summary of the invention
The technical problem to be solved is to provide a kind of RCCB that can realize automatic trip and automatic switching-in function according to the situation of the gradual leakage current in power supply circuits and sudden change leakage current.
For solving above-mentioned technical problem, the RCCB of the present invention, including: inside is provided with the housing of electrical apparatus release and control circuit, described control circuit includes: central control unit, for detecting the sensor for detecting electric leakage of the leakage current of A phase, B phase and C phase power supply, the dropout drive circuit being connected with the dropout control signal outfan of central control unit, and motor；The amplified circuit of sensor for detecting electric leakage is connected with the detection of electrical leakage signal input part of central control unit, and the energization control signal outfan of central control unit is connected with the power end of motor through drive circuit；
Described control circuit also includes the digital switch circuit that the control signal input with central control unit is connected；Digital switch circuit includes: the first switch, second switch, the 3rd switch and the 4th switch；Digital switch circuit is for arranging the threshold values of sudden change and gradual leakage current, to control the action of electrical apparatus release；
Current stabilization circuit includes the first series circuit being made up of resistance R39 and R40, the second series circuit being made up of resistance R22 and R41, the 3rd series circuit that is made up of resistance R37 and R42, A phase, B phase and C phase current sensor T3, T4 and T5 are in parallel with described resistance R40, R41 and R42 respectively, the power detecting end of central control unit 1 is the 2nd of single-chip microcomputer IC1 the, 3 and 4 feet, is connected with above-mentioned first, second, and third series circuit respectively；
When the most described first switch Guan Bi, the threshold values of the first preset value namely sudden change leakage current is 50mA, and the threshold values of the second preset value namely gradual leakage current is 300mA；
When the most described second switch closes, described first preset value is 75mA, and described second preset value is 500mA；
When the most described first switch and second switch close, described first preset value is 100mA, and described second preset value is 1000mA；
When the most described first switch and the 3rd switch Guan Bi, described first preset value is 50mA, and described second preset value is 400mA；
When the most described second switch and the 3rd switch Guan Bi, described first preset value is 75mA, and described second preset value is 1000mA；
When described 4th switch Guan Bi, described first preset value is infinitely great, i.e. closes sudden change leakage current detection function；
Described Transformer Rectifier mu balanced circuit includes: the transformator T1 being sequentially connected in series, the rectification circuit being made up of diode D1-diode D4 and the mu balanced circuit being made up of with stabilivolt D7 resistance R1；The secondary output end of transformator T1 is provided with lightning protection varistor R61；
Described dropout drive circuit includes: the on-off circuit that is connected with the dropout control signal outfan of central control unit, the 3rd relay and perform the dropout of trip action for controlling electrical apparatus release and drive coil；Described on-off circuit is located in the electric power loop of the 3rd relay, and the control output end of the 3rd relay is located in the described current supply circuit driving coil of threading off；
Making described on-off circuit close when the dropout control signal outfan of central control unit exports high level, and when making the 3rd relay obtain electric, thread off and drive the current supply circuit conducting of coil described in the 3rd Control, electrical apparatus release performs trip action；
When central control unit is recorded by sensor for detecting electric leakage, A phase, B phase or C phase power supply exist sudden change leakage current, and this sudden change leakage current more than the first preset value time, central control unit controls electrical apparatus release through dropout drive circuit and performs trip action, to cut off the electricity supply；
Gradual leakage current is there is when central control unit is recorded in A phase, B phase or C phase power supply by sensor for detecting electric leakage, and this gradual leakage current more than the second preset value time, central control unit 1 controls electrical apparatus release through dropout drive circuit and performs trip action, to cut off the electricity supply.
The present invention has positive effect: in (1) present invention, and control circuit also includes the digital switch circuit being connected with central control unit；Digital switch circuit is for arranging described sudden change and the threshold values of gradual leakage current, to control the action of electrical apparatus release.By controlling digital switch circuit, facilitating user and use different described sudden changes and the threshold values of gradual leakage current according to different use occasions, practicality is stronger.Wherein, described first preset value (sudden change leakage current value) is set to 50 or 75mA, can play a protective role when human electric shock, electric shock casualty accident can be prevented effectively from.(2) in the Transformer Rectifier mu balanced circuit of the present invention; the secondary output end of transformator is provided with lightning protection varistor; lightning protection varistor under normal conditions is 22M Ω; when the RCCB of the present invention is struck by lightning; the secondary output high-frequency high-voltage current of transformator; 10 Ω are down in the prevention of lightning protection varistor, play short circuit effect, effectively protect the control circuit of the present invention.(3), in the control circuit of the present invention, central control unit controls the action of the 3rd relay through on-off circuit, thus controls dropout and drive the break-make of coil current, and then controls the action of electrical apparatus release；Wherein, the 3rd relay is by vulnerabilities scan, and driving coil of threading off is controlled by high voltage power supply, i.e. by using the 3rd relay, has been effectively isolated light current and forceful electric power, it is ensured that the safety and reliability of control circuit.
Accompanying drawing explanation
Fig. 1 is the structure chart of the RCCB of the present invention；
Fig. 2 is the circuit block diagram of the RCCB of the present invention；
Fig. 3 is the circuit theory diagrams of the RCCB of the present invention.
Detailed description of the invention
(embodiment 1)
See Fig. 1, the RCCB of the present embodiment, including: inside is provided with the housing 2 of electrical apparatus release 10 and control circuit, housing 2 is provided with for driving electrical apparatus release 10 to perform the electronic conduction mechanism 3 of feed motion, this electronic conduction mechanism 3 includes motor 31, eccentric 32 and drive link 33, and described eccentric 32 is arranged on the output shaft of motor 31；Described electrical apparatus release 10 includes the joystick 10-1 stretched out from housing 2, and one end of drive link 33 is rotationally connected with eccentric 32, and the other end is with operation handle 10-1 strand even.
See Fig. 2-3, described control circuit includes: central control unit 1(model is the single-chip microcomputer IC1 of PIC16F74), for detecting the sensor for detecting electric leakage T2 of the leakage current of A phase, B phase and C phase power supply, for providing the Transformer Rectifier mu balanced circuit 4 of DC source, the dropout drive circuit 9 being connected with the dropout control signal outfan (the 34th foot of single-chip microcomputer IC1) of central control unit 1, the digital switch circuit 7 being connected with the control signal input (the 15th of single-chip microcomputer IC1 the, 16,17,24,25 and 26 foot) of central control unit 1, motor 31 , and A phase, B phase and C phase current sensor T3, T4 and T5；The amplified circuit of sensor for detecting electric leakage T2 3 is connected with the detection of electrical leakage signal input part (the 33rd foot of single-chip microcomputer IC1) of central control unit 1, and the energization control signal outfan (the 6th foot of single-chip microcomputer IC1) of central control unit 1 is connected through the power end of drive circuit 6 with motor 31.
When central control unit 1 is recorded by sensor for detecting electric leakage T2, A phase, B phase or C phase power supply exist sudden change leakage current, and this sudden change leakage current more than the first preset value time, central control unit 1 controls electrical apparatus release 10 through dropout drive circuit 9 and performs trip action, to cut off the electricity supply；After 30 seconds, central control unit 1 controls motor 31 through drive circuit 6 and rotates, motor 31 drives the operation handle 10-1 action of electrical apparatus release 10 through eccentric 32 and drive link 33, makes electrical apparatus release 10 perform feed motion and make described operation handle 10-1 be in closing position, is also turned on power supply.
Gradual leakage current is there is when central control unit 1 is recorded in A phase, B phase or C phase power supply by sensor for detecting electric leakage T2, and this gradual leakage current more than the second preset value time, central control unit 1 controls electrical apparatus release 10 through dropout drive circuit 9 and performs trip action, to cut off the electricity supply；After 5 minutes, central control unit 1 controls motor 31 through drive circuit 6 and rotates, and motor 31 drives the operation handle 10-1 action of electrical apparatus release 10 through eccentric 32 and drive link 33, and makes electrical apparatus release 10 perform feed motion, to switch on power；If the most gradual leakage current is still above the second preset value, central control unit 1 controls electrical apparatus release 10 through dropout drive circuit 9 and performs trip action, and makes described operation handle 10-1 be in trip positions, cuts off the electricity supply simultaneously.
Described A phase, B phase are connected with the power detecting end (the 2nd of single-chip microcomputer IC1 the, 3 and 4 foot) of central control unit 1 through current stabilization circuit 5 with T5 with C phase current sensor T3, T4；When central control unit 1 is recorded when wherein there is overcurrent, short circuit current or phase shortage by A phase, B phase and C phase current sensor T3, T4 and T5, and central control unit 1 controls electrical apparatus release 10 through dropout drive circuit 9 and performs trip action, to cut off the electricity supply.
Described digital switch circuit 7 includes: the first switch K1, second switch K2, the 3rd switch K3 and the 4th switch K4 being connected with the 26th, 25,24 and 17 feet of single-chip microcomputer IC1 respectively.
When the most described first switchs K1 Guan Bi (now, low level at the 26th foot of single-chip microcomputer IC1), described first preset value is 50mA, and the second preset value is 300mA.
When the most described second switch K2 closes (now, low level at the 25th foot of single-chip microcomputer IC1), described first preset value is 75mA, and the second preset value is 500mA.
When the most described first switchs K1 and second switch K2 Guan Bi, described first preset value is 100mA, and the second preset value is 1000mA.
When the most described first switchs K1 and the 3rd switch K3 Guan Bi (now, low level at the 26th and 24 feet of single-chip microcomputer IC1), described first preset value is 50mA, and the second preset value is 400mA.
When the most described second switch K2 and the 3rd switch K3 Guan Bi, described first preset value is 75mA, and the second preset value is 1000mA.
When the described 4th switchs K4 Guan Bi (now, low level at the 17th foot of single-chip microcomputer IC1), described first preset value is infinitely great, i.e. closes sudden change leakage current detection function.
Described Transformer Rectifier mu balanced circuit 4 includes: the transformator T1 being sequentially connected in series, the rectification circuit being made up of diode D1-D4 and the mu balanced circuit being made up of with stabilivolt D7 resistance R1；The secondary output end of transformator T1 is provided with lightning protection varistor R61.
Described dropout drive circuit 9 includes: the on-off circuit (being made up of audion Q8, resistance R4 and diode D10) that is connected with the dropout control signal outfan (the 34th foot of single-chip microcomputer IC1) of central control unit 1, the 3rd relay X3 and perform the dropout of trip action for controlling electrical apparatus release 10 and drive coil L；Described on-off circuit is located in the electric power loop of the 3rd relay X3, and the control output end of the 3rd relay X3 is located in the described current supply circuit driving coil L of threading off, and the 3rd relay X3 is used for controlling to thread off driving coil L to access between A phase firewire and zero line N.
Make described on-off circuit close when the dropout control signal outfan of central control unit 1 exports high level, and when making the 3rd relay X3 obtain electric, the 3rd relay X3 controls described dropout and drives the current supply circuit conducting of coil L, and electrical apparatus release 10 performs trip action.
The display unit 8 being made up of charactron LG381, audion Q1-4 etc., the display signal output part of central control unit 1 connects the signal input part of charactron LG381.
Described current stabilization circuit 5 includes the first series circuit being made up of resistance R39 and R40, the second series circuit being made up of resistance R22 and R41, the 3rd series circuit that is made up of resistance R37 and R42, A phase, B phase and C phase current sensor T3, T4 and T5 are in parallel with described resistance R40, R41 and R42 respectively, the power detecting end of central control unit 1 is the 2nd of single-chip microcomputer IC1 the, 3 and 4 feet, is connected with above-mentioned first, second, and third series circuit respectively.
The DC output end of the rectification circuit of described Transformer Rectifier mu balanced circuit 4 is provided with the first relay X1, the outfan of the first relay X1 is located in the electric power loop of described 3rd relay X3, i.e. when the first relay X1 Guan Bi, 3rd relay X3 also closes, so that electrical apparatus release 10 performs trip action.Therefore, as long as making the first relay X1 Guan Bi, electrical apparatus release 10 just can be in trip status all the time, to prevent electrical apparatus release 10 from repeatedly closing a floodgate the harm that may bring.First relay X1 Guan Bi or disconnection, can be by manually being controlled by digital switch K7.
Described amplifying circuit 3 includes that signal amplifies integration module PIC604 and peripheral auxiliary circuits thereof.
When supply line normally works, leakage current is gradual amount, if gradual leakage current is stepped up reaching to leak electricity during specified working value I Δ n, leakage relay action is tripped.When supply line occur people and animals get an electric shock even broken string land time, leakage current now is Sudden Changing Rate.Gradual discriminating is separated with Sudden Changing Rate owing to this type of leakage relay all uses when design, therefore Sudden Changing Rate is chosen is key component, generally individually use peaker detection (including positive negative pulse stuffing), when there is Sudden Changing Rate on the basis of certain gradual leakage current in circuit, peaker works, obtain a pulse signal, if this pulse signal is more than the sudden change specified working value Δ I Δ n of electric leakage, then leakage relay action tripping operation.In order to take into account gradual and sudden change electric leakage sensitivity and leakage relay operational reliability, general electric leakage working value I Δ n is all far longer than pulse action value Δ I Δ n.
Automatic reclosing operation principle brief analysis
By Fig. 1 fundamental diagram it can be seen that the detection of gradual amount and transient detection co-controlling automatic reclosing after comparison circuit differentiates performs circuit, DC relay connection point on-off in the machine control A.C. contactor break-make, complete automatic reclosing and trip avoidance function.Below reclosing work process during different drain conditions is made some and (as a example by positive pulse) is discussed:
(1) when line electrical leakage be gradual amount and incrementally increase exceed specified electric leakage working value I Δ n time, comparator A exports high potential, make reclosing perform circuit work.This signal yet suffers from after time delay, and leakage relay once trips locking, does not have automatic reclosing function.Restart after only closing leakage relay power supply, could bringing normally into operation.
(2) occur discussing in two kinds of situation when Sudden Changing Rate leaks electricity when circuit:
A Sudden Changing Rate is more than nominal pulse working value Δ I Δ n, but less than specified electric leakage working value Δ n, and sustainable existence after time delay after one minute, as shown in Figure 2.Now transient detection circuit work, and make reclosing circuit work through comparator B, reclosing again after time delay in a minute, but owing to circuit still suffers from fault electric leakage Δ I Δ, (Δ I Δ n≤Δ I Δ≤I Δ n) makes reclosing circuit again trip, and have reclosing several times to occur, if so-called two-hit phenomenon the most easily occurs in human electric shock.If in time delay one minute, this fault current disappears, then reclosing circuit automatic closing, normal operating condition recovers in supply line.
The electric leakage of b Sudden Changing Rate is more than nominal pulse working value Δ I Δ n and exceed specified electric leakage working value I Δ n, and after time delay one minute, this leakage current yet suffers from.The Sudden Changing Rate occurred in the t1 moment first by Sudden Changing Rate electric circuit inspection after make reclosing circuit work; A.C. contactor trips; leakage current reduces to zero; again close a floodgate after time delay in a minute; now still exist due to fault electric leakage, and more than I Δ n, in the t3 moment, gradual amount testing circuit is worked; reclosing circuit trips and protection blocking again, completes single shot reclosing function.

Claims (1)

1. a RCCB, the housing of electrical apparatus release and control circuit it is provided with including inside, described control circuit includes: central control unit, for detecting the sensor for detecting electric leakage of the leakage current of A phase, B phase and C phase power supply, the dropout drive circuit being connected with the dropout control signal outfan of central control unit, and motor；The amplified circuit of sensor for detecting electric leakage is connected with the detection of electrical leakage signal input part of central control unit, and the energization control signal outfan of central control unit is connected with the power end of motor through drive circuit；
It is characterized in that including: described control circuit also includes the digital switch circuit that the control signal input with central control unit is connected；Digital switch circuit includes: the first switch, second switch, the 3rd switch and the 4th switch；Digital switch circuit is for arranging the threshold values of sudden change and gradual leakage current, to control the action of electrical apparatus release；
Current stabilization circuit includes the first series circuit being made up of resistance R39 and R40, the second series circuit being made up of resistance R22 and R41, the 3rd series circuit that is made up of resistance R37 and R42, A phase, B phase and C phase current sensor T3, T4 and T5 are in parallel with described resistance R40, R41 and R42 respectively, the power detecting end of central control unit 1 is the 2nd of single-chip microcomputer IC1 the, 3 and 4 feet, is connected with above-mentioned first, second, and third series circuit respectively；
When the most described first switch Guan Bi, the threshold values of the first preset value namely sudden change leakage current is 50mA, and the threshold values of the second preset value namely gradual leakage current is 300mA；
When the most described second switch closes, described first preset value is 75mA, and described second preset value is 500mA；
When the most described first switch and second switch close, described first preset value is 100mA, and described second preset value is 1000mA；
When the most described first switch and the 3rd switch Guan Bi, described first preset value is 50mA, and described second preset value is 400mA；
When the most described second switch and the 3rd switch Guan Bi, described first preset value is 75mA, and described second preset value is 1000mA；
When described 4th switch Guan Bi, described first preset value is infinitely great, i.e. closes sudden change leakage current detection function；
Described Transformer Rectifier mu balanced circuit includes: the transformator T1 being sequentially connected in series, the rectification circuit being made up of diode D1-diode D4 and the mu balanced circuit being made up of with stabilivolt D7 resistance R1；The secondary output end of transformator T1 is provided with lightning protection varistor R61；
Described dropout drive circuit includes: the on-off circuit that is connected with the dropout control signal outfan of central control unit, the 3rd relay and perform the dropout of trip action for controlling electrical apparatus release and drive coil；Described on-off circuit is located in the electric power loop of the 3rd relay, and the control output end of the 3rd relay is located in the described current supply circuit driving coil of threading off；
Making described on-off circuit close when the dropout control signal outfan of central control unit exports high level, and when making the 3rd relay obtain electric, thread off and drive the current supply circuit conducting of coil described in the 3rd Control, electrical apparatus release performs trip action；
When central control unit is recorded by sensor for detecting electric leakage, A phase, B phase or C phase power supply exist sudden change leakage current, and this sudden change leakage current more than the first preset value time, central control unit controls electrical apparatus release through dropout drive circuit and performs trip action, to cut off the electricity supply；
Gradual leakage current is there is when central control unit is recorded in A phase, B phase or C phase power supply by sensor for detecting electric leakage, and this gradual leakage current more than the second preset value time, central control unit 1 controls electrical apparatus release through dropout drive circuit and performs trip action, to cut off the electricity supply.
CN201610460929.1A 2012-07-27 2012-07-27 Electric leakage circuit breaker Withdrawn CN105977112A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610460929.1A CN105977112A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610460929.1A CN105977112A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201210262479.7A CN102904208B (en) 2012-07-27 2012-07-27 A kind of RCCB

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201210262479.7A Division CN102904208B (en) 2012-07-27 2012-07-27 A kind of RCCB

Publications (1)

Publication Number Publication Date
CN105977112A true CN105977112A (en) 2016-09-28

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Family Applications (10)

Application Number Title Priority Date Filing Date
CN201610458644.4A Withdrawn CN106058805A (en) 2012-07-27 2012-07-27 Residual-current circuit breaker
CN201610458643.XA Withdrawn CN106057592A (en) 2012-07-27 2012-07-27 Residual-current circuit breaker
CN201610464969.3A Withdrawn CN105957780A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201610460929.1A Withdrawn CN105977112A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201610459872.3A Withdrawn CN105957779A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201610459568.9A Withdrawn CN106058807A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201610464970.6A Withdrawn CN106098484A (en) 2012-07-27 2012-07-27 A kind of RCCB
CN201610461205.9A Withdrawn CN106024544A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201610458941.9A Withdrawn CN106058806A (en) 2012-07-27 2012-07-27 Residual-current circuit breaker
CN201210262479.7A Expired - Fee Related CN102904208B (en) 2012-07-27 2012-07-27 A kind of RCCB

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CN201610459568.9A Withdrawn CN106058807A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201610464970.6A Withdrawn CN106098484A (en) 2012-07-27 2012-07-27 A kind of RCCB
CN201610461205.9A Withdrawn CN106024544A (en) 2012-07-27 2012-07-27 Electric leakage circuit breaker
CN201610458941.9A Withdrawn CN106058806A (en) 2012-07-27 2012-07-27 Residual-current circuit breaker
CN201210262479.7A Expired - Fee Related CN102904208B (en) 2012-07-27 2012-07-27 A kind of RCCB

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CN104360616A (en) * 2014-10-31 2015-02-18 宁波市鄞州祥弘电子有限公司 Automatic gradient gel mixing device and control circuit and control method thereof
CN104953550B (en) * 2015-05-19 2018-12-14 中国核电工程有限公司 A kind of earth leakage protective device of motor
CN105137876A (en) * 2015-08-25 2015-12-09 孙鸿昌 Industrial intelligent detection circuit control system
CN105576597A (en) * 2016-02-29 2016-05-11 上海电机学院 Residual current motion protection method and device

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CN2655414Y (en) * 2003-10-20 2004-11-10 郑祥衡 Phase and amplitude discriminating electric leak relay
CN2746621Y (en) * 2004-09-03 2005-12-14 任增辉 Intelligent earth leakage protective device
JP2011250486A (en) * 2010-05-21 2011-12-08 Panasonic Electric Works Co Ltd Earth leakage breaker
CN202917947U (en) * 2012-07-27 2013-05-01 苏州贝腾特电子科技有限公司 Electric leakage circuit breaker

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CN106098484A (en) 2016-11-09
CN106024544A (en) 2016-10-12
CN102904208B (en) 2016-08-03
CN102904208A (en) 2013-01-30
CN106057592A (en) 2016-10-26
CN106058806A (en) 2016-10-26
CN105957780A (en) 2016-09-21
CN106058807A (en) 2016-10-26
CN106058805A (en) 2016-10-26

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